Supporting device



FIG. 1 is a perspective view of a supporting device showing our design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side, elevational view thereof;

FIG. 5 is a right side, elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines of all the figures are for the purpose of illustrating environmental structures and form no part of the claimed design. 

The ornamental design for a supporting device, as shown and described. 